华侨和港澳台学生每年可买()次学生票。
A.2;
B.4;
C.6;
D.8。
参考答案:B
Could you please ______ the window? It's very cold outside. [ ]
A. not open
B. open
C. not to open
项目的β值为1.8,假定rf=8%,E(rM)=16%,则项目的净现值为( )。
A.11.15
B.12.76
C.16.30
D.18.09